Antibody stabilization for thermally accelerated deep immunostaining

• Published in: Nature methods Vol. 19; no. 9; pp. 1137 - 1146
• Main Authors: Lai, Hei Ming, Tang, Yumi, Lau, Zachary Y. H., Campbell, Robert A. A., Yau, Juno C. N., Chan, Caleb C. Y., Chan, Danny C. W., Wong, Tin Yan, Wong, Harriet K. T., Yan, Leo Y. C., Wu, William K. K., Wong, Sunny H., Kwok, Ka-Wai, Wing, Yun-Kwok, Lam, Henry H. N., Ng, Ho-Keung, Mrsic-Flogel, Thomas D., Mok, Vincent C. T., Chan, Jason Y. K., Ko, Ho
• Format: Journal Article
• Language: English
• Published: New York Nature Publishing Group US 01.09.2022; Nature Publishing Group
• Subjects: 631/1647/245/2225; 631/1647/328; 631/1647/338/469; 631/378; Animals; Antibodies; Antibodies - metabolism; Bioinformatics; Biological Microscopy; Biological Techniques; Biomedical and Life Sciences; Biomedical Engineering/Biotechnology; Brain; Brain - metabolism; Denaturation; Humans; Life Sciences; Macromolecules; Mice; Penetration; Proteomics; Spears; Staining; Temperature requirements; Thermal cycling
• ISSN: 1548-7091; 1548-7105; 1548-7105
• DOI: 10.1038/s41592-022-01569-1

Antibodies have diverse applications due to their high reaction specificities but are sensitive to denaturation when a higher working temperature is required. We have developed a simple, highly scalable and generalizable chemical approach for stabilizing off-the-shelf antibodies against thermal and chemical denaturation. We demonstrate that the stabilized antibodies (termed SPEARs) can withstand up to 4 weeks of continuous heating at 55 °C and harsh denaturants, and apply our method to 33 tested antibodies. SPEARs enable flexible applications of thermocycling and denaturants to dynamically modulate their binding kinetics, reaction equilibrium, macromolecular diffusivity and aggregation propensity. In particular, we show that SPEARs permit the use of a thermally facilitated three-dimensional immunolabeling strategy (termed ThICK staining), achieving whole mouse brain immunolabeling within 72 h, as well as nearly fourfold deeper penetration with threefold less antibodies in human brain tissue. With faster deep-tissue immunolabeling and broad compatibility with tissue processing and clearing methods without the need for any specialized equipment, we anticipate the wide applicability of ThICK staining with SPEARs for deep immunostaining. Thermostable antibodies called SPEARs enable rapid immunostaining with improved tissue penetration.